参数资料
型号: ST72511R9T3/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
封装: 14 X 14 MM, TQFP-64
文件页数: 113/164页
文件大小: 1043K
代理商: ST72511R9T3/XXX
ST72311R, ST72511R, ST72512R, ST72532R
52/164
10.2 MAIN CLOCK CONTROLLER WITH REAL TIME CLOCK TIMER (MCC/RTC)
The Main Clock Controller consists of three differ-
ent functions:
s
a programmable CPU clock prescaler
s
a clock-out signal to supply external devices
s
a real time clock timer with interrupt capability
Each function can be used independently and si-
multaneously.
10.2.1 Programmable CPU Clock Prescaler
The programmable CPU clock prescaler supplies
the clock for the ST7 CPU and its internal periph-
erals. It manages SLOW power saving mode (See
Section 7.2 ”SLOW MODE” on page 34 for more
details).
The prescaler selects the fCPU main clock frequen-
cy and is controlled by three bits in the MISCR1
register: CP[1:0] and SMS.
CAUTION: The prescaler does not act on the CAN
peripheral clock source. This peripheral is always
supplied by the fOSC/2 clock source.
10.2.2 Clock-out Capability
The clock-out capability is an alternate function of
an I/O port pin that outputs a fOSC/2 clock to drive
external devices. It is controlled by the MCO bit in
the MISCR1 register.
CAUTION: When selected, the clock out pin sus-
pends the clock during ACTIVE-HALT mode.
10.2.3 Real Time Clock Timer (RTC)
The counter of the real time clock timer allows an
interrupt to be generated based on an accurate
real time clock. Four different time bases depend-
ing directly on fOSC are available. The whole func-
tionality is controlled by four bits of the MCCSR
register: TB[1:0], OIE and OIF.
When the RTC interrupt is enabled (OIE bit set),
the ST7 enters ACTIVE-HALT mode when the
HALT instruction is executed. See Section 7.4
”ACTIVE-HALT AND HALT MODES” on page 36
for more details.
Figure 29. Main Clock Controller (MCC/RTC) Block Diagram
DIV2,4,8,16
MCC/RTC INTERRUPT
DIV 2
SMS
CP1 CP0
TB1 TB0 OIE OIF
CPU CLOCK
MISCR1
RTC
COUNTER
CLOCK TO CAN
TO CPU AND
PERIPHERALS
fOSC
fCPU
MCO
PORT
FUNCTION
ALTERNATE
MCO
-
0
MCCSR
fOSC/2
PERIPHERAL
相关PDF资料
PDF描述
ST72511R9T6S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72512R4T6S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72511R7T3S/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72521BAR6T6/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
ST72521BM9T5/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80
相关代理商/技术参数
参数描述
ST72561K4 制造商:STMicroelectronics 功能描述:LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS,FLASH MEMORY, - Bulk
ST72589-EMU2 功能描述:仿真器/模拟器 ST7 Emulator Board RoHS:否 制造商:Blackhawk 产品:System Trace Emulators 工具用于评估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2
ST72611F1 制造商:STMicroelectronics 功能描述:LOW SPEED USB 8-BIT MCU WITH 3 ENDPOINTS,FLASH MEMORY, - Bulk
ST7263-EMU2 功能描述:仿真器/模拟器 ST7 Emulator Board RoHS:否 制造商:Blackhawk 产品:System Trace Emulators 工具用于评估:C6000, C5000, C2000, OMAP, DAVINCI, SITARA, TMS470, TMS570, ARM 7/9, ARM Cortex A8/R4/M3 用于:XDS560v2
ST7265X-EVAL/MS 制造商:STMicroelectronics 功能描述:ST6 EVAL BD - Bulk